horn fly vs Haematobia irritans

horn fly and Haematobia irritans both are nouns.

Word	Noun	Adjective	Verb	Adverb
horn fly	Yes	No	No	No
Haematobia irritans	Yes	No	No	No

As nouns, horn fly and Haematobia irritans are synonyms defined as:

horn fly and Haematobia irritans: small black European fly introduced into North America; sucks blood from cattle especially at the base of the horn

horn fly (noun)	Haematobia irritans (noun)
small black European fly introduced into North America; sucks blood from cattle especially at the base of the horn	small black European fly introduced into North America; sucks blood from cattle especially at the base of the horn